The ACR-3 can recall memory presets and control output level on the DM Processors and Matrix DSP Amplifiers.
You can select up to 4 memory presets by pressing the ACR-3 knob and turning the knob left or right to select the desired preset.
Learn more on how to select Memory Presets here
The ACR-3 can also control output level. The user would determine what outputs the ACR-3 controls when setting up memory presets in the DM Smart DSP software.
For example, the ACR-3 can be setup to be a Master level control by enabling the ACR-3 to control level on all outputs. Another common application is to set a specific output as a sub woofer output and enable the ACR-3 to control just that output.
Learn more about how control Output Level using the ACR-3 here